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Pedernales River
The Pedernales River in Pedernales Falls State Park, Blanco County, Texas
Origin	Kimble County, Texas, U.S.A.
Mouth	Lake Travis, Texas, U.S.A.
Basin countries	U.S.A
Length	106 mi (170 km)
Source elevation	2200 ft (671 m)
Avg. discharge	80 ft³/s (2.3 m³/s)
Basin area	1273 mi² (3297 km²)

The Pedernales River (pronounced [ˌpɝdəˈnæləs]) is a tributary of the Colorado River, approximately 106 miles (170 km) long, in central Texas in the United States. It drains an area of the Edwards Plateau, flowing west to east across the Texas Hill Country west of Austin.

The river rises from springs in southeastern Kimble County, approximately 25 miles (40 km) southeast of Junction. It flows generally east into Gillespie County, past Fredericksburg, and into Blanco County, passing north of Johnson City. It joins the Colorado from the southwest in Lake Travis, approximately 10 miles (16 km) west of Austin.

The river has a close association with the Texas Hill Country, tied to the history of the region and emblematic of its geography. Along its route it flows over numerous rugged limestone escarpments as it winds eastward, passing along the north side of the ranch of President Lyndon B. Johnson, who grew up in nearby Stonewall, south of the river. The name "Pedernales", first used in the middle 18th century, comes from a Spanish word for the flint rocks characteristic of the riverbed. In 1750, Fray Benito Fernández de Santa Ana proposed a plan to the Spanish government that a mission be established among the Lipan Apache who lived along the river. In 1789, the river was the site of a skirmish between Colonel Francisco Xavier Ugalde and a group of Lipan and Mescalero Native Americans. The first permanent white settlement along the river was in 1846, when the town of Fredericksburg was establishment by German immigrants. The threat of raids from Apaches restricted settlement in the area until the 1880s.

Pedernales Falls State Park is located along the river in Blanco County east of Johnson City. Like many rivers in central Texas, it is prone to variable water levels. A sign at the state park shows a relatively tranquil river in one picture and a raging wall of muddy water in the next picture, said to be taken only five minutes after the first. The speed at which flash floods can arise along this river has resulted in several deaths at the park, and warning sirens have been installed in the park and elsewhere along the river. The lower river is a popular destination for whitewater rafting during the high-water season. The Johnson ranch is now operated by the National Park Service as Lyndon B. Johnson National Historical Park.

• Llano River
• List of Texas rivers

• Pedernales River from the Handbook of Texas Online
• Pedernales Falls State Park
• NPS: Lyndon B. Johson National Historical Park